Just one day after production officially started on the Lionsgate action-comedy American Ultra, Sharon Stone has joined the cast, replacing Uma Thurman.

We reported last month that Uma Thurman was in talks to play a government agent who creates a top-secret program that trains sleeper agents, but now Sharon Stone will portray this character, named Victoria Lasseter. Jesse Eisenberg stars as Mike, a lazy stoner who learns the he is actually a highly-trained assassin within this program, as he must summon his inner hero to survive a deadly operation. Kristen Stewart plays his live-in girlfriend, with Topher Grace, Tony Hale, John Leguizamo, Bill Pullman and Walton Goggins starring in unspecified roles.

Nima Nourizadeh (Project X) is directing from a screenplay by Max Landis, with Anthony Bregman, Kevin Scott Frakes, Raj Brinder Singh, David Alpert and Britton Rizzio producing.

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Sharon Stone will next be seen in Fading Gigolo, which opens in theaters this weekend. She also signed on to star in the TNT pilot Agent X back in January.